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git: fix parsing of author lines

we had two problems: the lines could get a bit tight when someone could have
very long names, and the author name was being copied into the buffer incorrectly.

--- a/sys/src/cmd/git/pack.c

+++ b/sys/src/cmd/git/pack.c

@@ -835,7 +835,8 @@

 	if(n >= sizeof(buf))

 		sysfatal("overlong author line");

 	memset(m, 0, sizeof(m));

-	snprint(buf, n + 1, *str);

+	memcpy(buf, *str, n);

+	buf[n] = 0;

 	*str = p;

 	*nstr -= n;

@@ -862,7 +863,7 @@

 static void

 parsecommit(Object *o)

 {

-	char *p, *t, buf[128];

+	char *p, *t, buf[512];

 	int np;

 	p = o->data;

-- 

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